There are several frogguy transliteration systems, of increasing of
complexity, and each more complex system is downward compatible
with the simpler one. They really form a continuum, but you can consider
if you like, that there are four separate frogguy systems.

All systems have the same principles in common:

We cannot be certain of what constitutes a Voynich letter. Therefore,
we use symbols to represent probable letters or *parts* of letters.

The symbols used, Roman letters, Arabic digits, punctuation marks,
are chosen to look as much as possible like the Voynich letters or parts
of letters which they represent.

Thus for instance, Currier's <B>, which we probably all agree is a single
character, is represented in frogguy by two symbols [qj] because it
consists of two very common parts, used in the formation of other
Voynich characters, and which look a bit like "q" and "j".

The most basic frogguy, call it frogguy-0, is probably the one you are
familiar with. It has all the necessary pieces to represent everything
that can be represented in Currier's system and a little bit more. It
lacks symbols for rare characters, such as the famous "picnic table". It
uses 3 digits [4 8 9], 12 letters [a c g i j l o p q s t v] and the
apostrophe ['].

Frogguy-1 has additional symbols for those rare characters: the "picnic
table" [n], the "inverted y" [y], the "squashed z" [z], the "circumflex"
(or, if you prefer, "Chinese hat", or "inverted hacek", or "tent": [^]),
the "circumflex in a corner" [k].

Frogguy-2 has parts for representing the "weirdoes" first identified and
reported by Jim Reeds.

Even when I knew Currier's system by heart, I just could never see in my
mind's eye what ZORBSOR OBSOR ZOR FS9 (end of line 1 of f49r) really
looked like in Voynich letters; I had to grab a pen and write it down.

Now I am terribly lazy, and I object to such violent exercises as
weight-lifting (even a pen) and long-distance running (even on paper).
Violent mental exercises, such as *remembering* the 36 symbols of
Currier's system, have my greying grey cells protest in unison: "you've
already stuffed us full of the Cyrillic alphabet, then Hebrew, then
Arabic, then all those Chinese characters, you stuff us with Balinese
letters every time you go there, which we hurry to forget as soon as you
are back, and now *THIS*!"

So, it was shortly before Christmas 1991, I invented this system
in which the very symbols of the transcription vaguely *look* like the
letters of the Voynich MS. From instance:

Then I designed a 16x8 bitmap font in which all those letters were
distorted a bit, just enough to make them into very Voynich-like
squiggles, while leaving them legible as Roman letters. I forgot how
this system came to be called "frogguy".

The discovery of "weirdoes", rare and sometimes not-so-rare Voynich
letters that were not accounted for in Currier forced me to tinker with
this "proto-frogguy" and to use and distort so many more Roman letters
that an English text became just about illegible when displayed in
Voynich font. Since the two fonts had become mutually unintelligible, I
wrote a WYSIWYG text editor for PCs (VOYEDIT, I think it's still in our
archives) which could handle both at once. And I worked at making the
Voynich fonts look even more like Voynich.

Fonts and transcription system were completed on Sunday, 26 July 1992,
and I have not been able to improve significantly on them since.

Voynich letters which look like lowercase Roman letters are
represented by those letters. Others, such as the "gallows" are
broken up into constituent strokes, each stroke represented by a
lowercase Roman letter, or a digit or a punctuation mark that looks
as much as possible like it or its mirror-image.

To show that a letter connects to a letter to its right,
capitalize it.

Since the two components of a "gallows" always connect, do not
capitalize them. Capitalize only the elements of "intruding
gallows", that is, gallows cut through by a line connecting
two flanking letters as in Currier's <Q>, <W>, <X> and <Y>.

Note. The capitalization scheme is only there to make
transliterations look very much more Voynich-like when viewed with
the F3W00.FNT fonts file loaded. You may dispense with it.

Most cases of connected letter pairs involve a letter similar to
Currier's <C>, which in Frogguy is represented by a lowercase [c]
(Basic Frogguy) or [e] (Frogguy-3) when on the left and a
lowercase [t] when on the right (so that Currier's <S> is [ct]).
So Jim's X55 is, naturally, [ea], his X9 [ot] and his X10 [it]
without any ambiguity possibly arising.

Where the connection involves neither [e] nor [t], use a hyphen to
represent the connecting line, or capitalize every letter
connected to another on its right, e.g. Jim's X91 = [a-a] or [Aa]

Intruding gallows are always flanked by connected letters, so that
"intruding", entirely determined by the context, is redundant. The
uppercase set of gallows elements in F3W00.FNT is there only for
aesthetic purposes.

1. FROGGUY LETTERS THAT ARE ALSO WHOLE CURRIER LETTERS

Currier Frogguy Comment
A a
C c
O o
E x Voynich letter looks like an "x" closed at the top
4 4
8 8
9 9
R 2 looks like s "2" standing on tiptoe
2 s looks like the mirror-image of an "s"
I i
D v looks like a "v" with a flourish
7 & This rare letter looks likes the mirror-image of an
ampersand. I have redesigned this letter to look
like what it really looks like: <8> with its
first stroke i-like instead of c-like.

2. PARTS OF CURRIER LETTERS

g the loop and tail that make the right half
of Currier's <6>
t right half of Currier's <S> and <Z>, which
does look like "t" of some medieval scripts.
q left half of Currier's <P>, which looks like a
"q" standing on the base line
l left half of Currier's <F>, same as [q], but without a
loop. Looks like an "l".
p right half of Currier's <F> and <P>, which looks
like a capital "P"
j right half of Currier's <B> and <V>. The dot of
the "j" represents the loop, the rest the curve
which sweeps down, then left, to cross the leg
of the left part of the gallows to end up in a
hook (a open "noose") on its left side.

4. LETTERS THAT ARE NOT IN CURRIER'S ALPHABET

Jim's ID F3W
X49 ^ the "Chinese hat". Looks like an oversize
circumflex resting on the base line
X51 y looks like a mirror-image of y
X72 z looks like a squashed-out z
X48 n The picnic table. The letter n looks a bit like a
table, so there.
X50 k The "Chinese hat in a corner". Mnemonics:
underline the k, or link the heel of its straight
leg on the left to the heel of its bent leg on
the right.

1. PARTS OF RARE CHARACTERS

- (hyphen) a horizontal connecting line.
' (apostrophe) a plume, like that in Currier's
<Z>, or Jim's weirdoes X11, X14, X15, X35 etc.
, (comma) a flourish, sweeping down, like the
tail of <9>, which I have seen a few times in
Petersen (with 'sic' in the margin), Jim's
X107.
" a plume on top of a connecting line.
Mnemonics: on many keyboards " is obtained by pressing
shift and ', so that it is an apostrophe "capitalized",
hence, according to the capitalization rule, with a
connecting line.
+ a plume cutting through a connecting line, such as you
often find in Currier's <Z>.
Mnemonics: a plus sign is made of a line (plume) cutting
a horizontal line.
) to accomodate Jim's X13 and X16. This represents
a flourish connected at the base line to a letter
to the left, and curling back up. If I were to
take my analytic madness to extremes, my [v],
Currier's <D>, would become [i)]
` Jim's X104, which enters as an element of X43
and X46. Always connects to the right. It is a hook,
like this:
(__
^
connected there to the top of the next letter.

2. FROGGUY-3

Frogguy-3 uses three additional symbols, the capitalization rule, and
the parts of the rare characters above to represent the Voynich symbols
and their variants more closely.

e This is [c] connected to the letter on the right.
Mnemonics: "e" is a "c" with a stroke inside. Pull the
stroke out, use it to connect to the next letter.
d This is [l] when followed by [j]. Mnemonics: the "belly"
of "d" is the final swish of the noose [j], which ends
on the left of the gallows' leg.
f This is [q] when followed by [j]. Mnemonics: imagine the
mirror-image of "f".

3. SOME CURRIER LETTERS IN FROGGUY-3

Currier Frogguy
S et Basic Frogguy: [ct]
Z e't Basic Frogguy: [c't]
St when the plume is right on top and connects so
cleanly that the left half of this letter looks
strikingly like Currier <2>, Frogguy [s]
e"t when the plume lies in-between
e+t when the plume cuts through the connecting
line
et' when the plume is on top the [t] (weirdo
X26 of Jim's list, which happens not infrequently
at all).
Mind you, I think myself that all that is
nit-picking, but who knows?
X eLPt <F> intruding, hence capitalized, into
<S>, which is [et]. Basic frogguy: [clpt]
Q eQPt <P> intruding into <S>. Basic frogguy: [cqpt]
V dj Straight gallows leg with noose end [d] and on
its right side the dangling noose [j].
Basic frogguy: [lj]
Y eDJt <V> intruding into <S>, hence capitalized.
Basic frogguy: [cljt]
B fj Gallows leg with loop and noose end [f] and
on its right side the dangling noose [j].
Basic frogguy: [qj]
W eFJt The same intruding into <S>, hence capitalized.
Basic frogguy: [cqjt]

4. MOST OF JIM'S WEIRDOES

Jim's ID F3W
X1 eet [c] connected to [c], connected to [c],
connected to [t].
X2 eqp [c] connected to [qp] not intruding
X3 eQPo [c] connected to [o], with [qp] intruding
X4 eQP9 [c] connected to [9], with [qp] intruding
X5 eLP9 [c] connected to [9], with [lp] intruding
X6 e9 [c] connected to [9]
X7 eo [c] connected to [o]
X8 e [c] connected to something
X9 Ot [o] connected to [t]
X10 It [i] connected to [t]
X11 4-o' [4] connected (-) to [o] with a plume
(') on top. Note: I think we could dispense
with the hyphen. The infamous [4] occurs
almost always followed by [o] and is always
lightly connected to it.
X12 e'o [c] with plume, connected to [o]
So if the plume is placed so that you think
that the left part is really <2> (s)
connected.
X13 c) [c] with a flourish curling up
X14 9' [9] with plume on top
X15 a' [a] with plume on top
X16 a) [a] with a flourish curling up
X17 ADJa [a] connected to [a] with intruding [dj]
Basic frogguy: [Alja]
X18 IDJt [i] connected to [t] with intruding [dj]
Basic frogguy: [iljt]
X19 49 I do not think this is a weirdo at all,
it's just that <4> followed by <9>. If
the connect does worry you, write [4-9]
X20 e'et
or Set [c] with plume, or [s], connected to [c],
connected to [t]
X21 e'eFJt
or SeFJt ditto, with intruding [fj]
Basic frogguy: [Scqjt] or [c-cqjt]
X22 eFJet' Well, I think you've got the idea, so I
or eFJes will dispense with explaining the obvious
and skip the Basic Frogguy equivalent.
X23 eDJet
X24 eQPAt
X25 eLPo
X26 et' or es
X27 e'a or Sa
X28 eLPo
X29 e'9 or S9
X30 iQPt
X31 iLPt
X33 9LPet Since it is capitalized (LP), the gallows
must be intruding between two flanking
connected letters, so we really don't have
to write out that [9] is connected. But if
you really insist, then: [9-LPet].
X34 4DJa Ditto, and [4] normally connects, too.
X35 49' or 4"9 depending on where the plume precisely is.
X36 4DJo
X37 4OPt
X38 O't
X39 O'9
X40 OQP9
X41 OQPo
X42 ODJt
X43 `l X104 connected to what looks like a gallows
straight left leg (approximate)
X44 `p X104 jerkily connected to what looks like a
gallows right leg (approximate)
X45 I have seen a few of those and thought they were
misshapen <8>. It could be approximated by [c]
connected to a gallows right leg, i.e. [ep]
X46 `lo X43 combined with [o]
X47 Cat got my tongue there
X48 n the picnic table as mentioned above
X49 ^
X50 k as mentioned
X51 y mirror-image of "y", as mentioned
X52 I have nothing to propose for this. I
suspect it is one of the components Jim
used in designing the Postscript fonts.
X53 k^
X54 I have nothing to offer for that weirdo
X55 ea obviously
X56 eLP
X57 Idj
X58 Ilp
X59 Ifj
X60 e something. I'd like to spot on of those in the VMS
before I propose anything.
X61 4qp
X62 4lp
X63 Oqp
X64 O'
X66 ex
X67 to X69 are cases where the left and right halves of a
gallows are separated by one or more letters. Since
left and right halves are treated as separate letters
in the Frogguy system and are known to be always
connected, no problem arises other than linking them
in your mind's eye when you see them on the
screen.
X71 Looks like a bit of disconnected gallows, as in X67
to X69.
X72 z
X73 QPt a Postscript component, I suppose
X74 e' or S ditto
X75 4c
X76 eFJ
X78 4' I have only seen it followed by [o]. An
element of X11?
X79 eLPet
X80 I'm not sure what this is. I think [c] and a
misshapen [x]
X81 e't or St That is Currier's <Z>! A Postscript glitch?
X82 eDJeS
X83 I [i] connected, an elementary stroke
X84 e" [c] connected, with connected plume to its
right, a component
X86 SLPo But the gallows are superscripted, not
intruding, so that is only an approximation
X87 eqp
X88 elp
X89 efj
X90 edj
X91 Aa [a] connected, hence capitalized, to [a]
X94 4o I don't think this is any different from the
infamously common sequence
X95 O" [o] connected to plume connected to...
X96 O"t
X97 O"9
X98 `FJo
X99 ox another case of misshapen [x] I think
unless it is [og] with the tail end missing?
X100 OLLJt only an approximation of this monster
X101 o' [o] with a plume on top
X012 O [o] connected to something on its right
X103 o this is obviously [o] when something on its
left connects to it.
X104 ` One of the parts of rarer characters
X105 - Ditto
X108 ) Ditto
X110 eFJet